Fluid pressure control system for multiple turbine installations



l July 18, 1950 H. c. MAY 2,515,962

FLUID PRESSURE CONTROL SYSTEM FOR v MULTIPLE TURBINE INSTALLATIONS Original Filed Aug. 23, 1944 4 Sheets-Sheet 1 IN VEN TOR liu 'ry 6. May

BY I

ATTORNEY July 18,1950

H. c. MAY 2,515,962 FLUID PRESSURE CONTROL SYSTEM FOR MULTIPLE TURBINE INSTALLATIONS Original Filed Aug. 23, 1944 -4 Sheets-Sheet 2 Tuna/us INVENTORV Hcimzy Ci m A TTORNE Y July 18, 1950 H. c. MAY

FLUID PRESSURE CONTROL SYSTEM FOR MULTIPLE TURBINE INSTALLATIONS Original Filed Aug. 23, 1944 4 Sheets-Sheet 3 STEAM cuT OFF INVENTOR. Harry GMqy ATTORNEY NEUTRAL FOR FORWARD REVERSE Ill/4714..

0 0 5 "01092 6 0 Q MP0 1 i i ni mfiw Q 0 25 2 i July 18, 1950 H. 2. MAY 2,515,952

FLUID PRESSURE CONTROL SYSTEM, FOR MULTIPLE TURBINE INSTALLATIONS Original Filed Aug. 23, 1944 4 Sheets-Sheet 4 INVENTOR. 10 Harry Cf M05 ATTORNEY Patented July 18, 19 50 [TED PATENT 1 OFFICE FLUID PRESS RE CONTROL SYSTEM FOR MULTIPLE TURBINEIVNSTALLATIONS Harry 0. May, East McKeesport, Pa.,;assignor to The WestinghouseAir Brake Company, Wilmerding, Pa., a eorporationof Pennsylvania Original application;August 23, 1944, Serial No. 550,691, new Patent No. 2,501,729, dated March 28, 1950. Divideda'nd this application July 31, 1945, Serial No. 607,925 I, 1

5 Claims; (01. 605-102) This invention relates to control apparatusandmore particularly to the fluid pressuretype for selectively controlling a plurality of different operations such as those relating to the control,

of a.reversible prime mover, the present application being a division of my copending application,- Serial No. 550,691, filed August 23, 1944, now Patent No. 2,501,729.; One object of the invention is the provision of a fluid pressure control apparatus for controlling the starting, running,,reversing and the powerg:

output or speed of a prime mover, such as; versible steam driven locomotive.

Another object of the invention is the provision of such an apparatu embodying means operative to prevent application of power to the prime mover for reversing its direction of movement until after the prime mover has. come to a complete stop.

of a control apparatus such as above defined em- Another object of the invention is the provision ,2

bodying means operable automatically to. limit.

- the speed of the prime mover in both directions of operation.

A further object of the invention is the provi- ,limiting the maximum speed of the locomotive,

and said means is also operable in case of slippin ofv the locomotive drivers on the rails to i cut off the supplyfof steam to the driving turbine so asto limit the speed or prevent racing of said .turbine.

Other objects and advantages will be apparent fromthe. following more detailed description of the invention.

Ingthe accompanying drawingsQFigs. 1 and 2 twhen laid side by side with Fig. 1 at theleft hand side, of.Fig. 2, is a diagrammatic view, partly in section andpartly in elevation, of a portion of a locomotive with the improved control apparatus sion of a control apparatus for a locomotive ot the type embodying a pressure lubricating; sys' tem, so constructed as to cut off the supply of motive power in case the pressure of lubricantlin.

said system becomes reduced to an undesirable low degree.

According to the above objects, the control.

apparatus is particularly adapted though not limited, for use in-controlling a rail locomotive of thetype embodying a forward steam turbine for driving the locomotive in an ahead direction and responsive to movement of the locomotive is 1. operative to prevent the supply of steam to the, 1 forward turbine while the locomotive ismoving in reverse or to the reverse turbine while the 10- comotive is moving forward, since it-is not desired to use the turbines for braking purposese A pressure lubricating system is provided for w maintaining a supply of lubricant under constant pressure-to the bearings of the turbines and other parts of the locomotive, and the control apparatus embodies means controlled by the pressure of lubricant in said system for automaticallycutting off the'supply of steam to the driving turbine in case thepr'essure of lubricant becomes reduced toa chosen low degree, due for instance to aassociated therewith; Fig. 3 is a partial plan view of an .operatorseontrol device which, in Fig. 1, is

shown mainly in vertical section; Figs. 4 to 8 are sectional views taken respectively on lines 4-4, 5-15, 6-1-8, l.-,l, and 8..-8 on the operators controlvalvedevice shown in Fig. 1; Fig. 9 is a view at anlenlarged scale and mainly in section of a portion of the operators control device shown in Fig; .1 Fig. lo-isa partial plan view of the interior of a portion of, the operators control device as seen on line ili-l9 in Fig. 9; Fig. 11 is a vertical sectionalview .of athrottle adjusting motor two of whichare shown in side elevation in Fig. 2; Fig. 12 is a vertical sectional view at an enlarged scale-of .a zero speed or stop detecting device shown in side elevation in Fig. 2; and Fig. 13 is a side elevationalview of a portion of the device shown in Fig..: 12- asaseen from the line l3-l3 in Fig: 12. l

' Description In the drawings the reference numeral l indicates a drive axle of a rail locomotive. A reduction gear housing ,2 is mounted on axle I and contains a driving gear wheel 3 secured to the axle! forturning same. This driving gear wheel is arranged toi'be operated by a smaller gear wheel 4 mounted on a jack shaft 5 which is journaledin the housing 2. pThe shaft 5"is arranged to be driven by gear wheels 6 which mesh with sm'allerdriving gear wheels I mounted on and arranged to be driven. by a shaft 8 having bearings in the housing 2 and extending out from either side thereof.

One end of shaft 8 is permanently connected to a forward steam turbine 9 which is arranged to be operated by ste'am suppliedthrough a pipe it! for driving axle I to propel the locomotive in a forward direction. Numeral ll indicates an exhaust pipe from the turbine 9.

A reverse turbine l2 arranged'to be bperated by-1 steam supplied through a pipe [3 dridfiaiiirig steam exhaust pipe I4 is adapted-todrivea shaft=-' The shaft extends into ai reduction gear housing l6 containing meshinggear wheel's t! and :8, the gear wheel ll being secured-to said shaft and the gear wheel [8 being secured to a shaft I9 which is journaled in said housing in coaxial relation with shaft 8 connected to the forward turbine 9. A clutch element is rigidly secured to shaft 8 to rotate therewith, and mount ed on the adjacent end of shaft I9 is a movable clutch element 2| arranged to cooperate'with" the disconnected as the case may be Thus when the reverse turbine I2 is employed for driving the locomotive the rotor (not shown) of the forward turbine will alsobe operated; but' the clutch 'elements 20 and 2| provide for the disco'nnecting'of the reverse turbine fromthe drive shaft 8 when' the engine is being driven by the forward turbine.

For operating the clutch to connect and-dis connect the reverse turbine to and from the drive shaft 8 there is provided a fluid pressure" con trolled motor comprising a cylinder 22 containing a piston 23 which is operatively "connected;

rough a rod 24 to one end of a lever z5 lever is arranged to rock about a fixed fulcru h,

26 provided intermediateitsends. -The opposite end of the lever is in the form of ayoke-strad- 1 dling the movable clutch element 2| and has op crating engagement therewith'withi'n' an annulargroove 21. At one side of the'piston' 23 there' is provided a pressure chamber '28 which is 'arranged to receive fluid under pressure 'from a clutch control pipe 29 for actuating-said piston P to rock the lever in a clockwise direction to urge the movable clutch element 'into' driving engagement with the fixed clutch element 20 *to I thereby operatively connect the reverse turbi'ne l2 to the drive shaft 8.- piston there is provided a chamber which contains a spring 30 which functionsto move 'the" piston 23 to the position in which it is shown in the drawing upon the release of fluid under'pres- At the other side of the sure from pipe 29 and chamber 28 for disengag ing the movable clutch element 2| from the-fixed clutch element 20 to thereby disconnect thereverse turbine l2 from the drive shaft 8.

The reference numeral 3| indicates a steam supply pipe on the locomotive-and this pipe is arranged to be constantly supplied with steam from the locomotive boiler. A cut-off valve 32' is provided to open and close communication be tween the steam supply pipe 3| and'a pipe 33;

and when open willadmit steam to the latter pip'eand'thereby'to two throttle valve devices 34 and 35 which are adaptedto regulatethe supply 1 of steam to pipes I0 and 13, respectively, and thus" to the respective forward and reverse'turbines -9 and I2.

The throttle valve device 34 mayvbeof any steam from pipe 33 to pipe I0 to effect operation of the turbine 9 at any desired speed or degree of power output, and for also cutting off the supply of steam to said turbine. For illustrative purposes only, the throttle valve'device' 34 is shown as being of the type arranged for control by movement of a lever 35 having a steam cut-01f position in which it is shown in the drawings, and -'-which is movable out of this position in a counterclockwise direction for supplying steam to "the-turbine in an amount proportional to the extent'of such movement. A dot and dash line 3'I indicatesa position which the lever 36 may assume to provide a maximum amount of steam wine-turbines The reverse throttle valve device 35 may be identical in construction to the forward throttle valve device 34 and may therefore comprise a lever 38 havinga steam cut-off position in which it is shown in the drawing, and which is adjustable out or this position in a counterclockwise direc- 33 to the reverse turbine'IZ.

Fluid pressure controlled throttle adjustiiig motors'40 and 4| are provided for adjusting the levers '36 and 38 of the forward and reverse throttle Valve devices 34 and 35,- respectively The eonstruction'and operation of these throttle adjusting motors will-be hereinafter more fully descrlbe'dL- The reference numeral 42 indicates a steam turbine which is connected to'the steam pipe-33 and' -Which is adapted'to operate continuously,

i. e.,'-as long-as there is steam pressure in said pipe.

supply pipe 444 to a pipe 45 and to maintain lubricant at a certain substantially constant pressure such as 35 pounds per square inch, in pipe 45 at all times when the locomotive is in use, saidpipe' 44 being supplied'with' oil from any suitable source, such as a sump (not shown).

The pipe 45 may convey lubricant under-pressure from pump'43 to the different bearings in the forward' 'andreverse turbines-and in the reduction -gears associated therewith and connecting said turbines to the axle I and to any f other part or parts of the locomotive where such lubricant is desired." For instance the-lubricant" pipe 45' leadsto the inlet of an impeller pump 46 arrangedto' be drivenby the-forward turbine 9. The pump 46 has an outlet to a pipe 41 whereby saidpump will operate to draw'oil from the constant-pressure-pipe 45 and deliver such oil to pipe 41-at a greater pressure which'will be substan- "tially proportional to thespeed of operation of theforw'ard-turbine and thereby to the forward speed of the locomotivefor reasons which will be hereinafterdes'cribed. A similar impeller pump 48 is arranged to be driven by the reverse turbine l2. ---The pump 48 has an inlet connected to the the locomotive when said turbine is used for propelling-the locomotive rearwardly, also for a reason which will be hereinafter described.

The-twothrottle adjustingmotors and 4| areidenticalin construction, each comprising, as suitable structure for regulating thesupply -of 'lb shown" in Fig. 11,- a casingcontaining a double The turbine 42 is provided for operating a lubricant pump 43 to supply lubricant from a acting power piston 59 having arod 5| extending through a suitable packing gland 52 to the exterior of the casing. The outer end of rod 5! of motor 49 is operatively connected to one end of the lever 36 of .the throttle valve device 3t, while in motor ll the. end of said rod is connected to one end of lever 38 of the; throttle valve device35. H

At one side of the power piston 50 there is provided a control chamber 53 which is connected by Way of a passage 5411;,0 a pilot structure 55 which is operative to vary the pressure of fluid in said chamber for controlling adjustment of the respective throttle valve device. At the opposite side of piston 59 there is provided a control chamber 56 which is connected to a control passage 57! and which contains a spring 58 acting on said piston for urging same in the direction of the righthand to the position in which it is shown in the drawings, Inrnotor 49 the passage 51 is connected. to a pipe 59 while in motor 9| said passageis connected to a pipe 60.

In operation, when fluid is supplied to chamber53 at a pressure sufiicient to overcomethe opposing pressure of spring 58, with chamber 9S open to atmosphere the piston 5d will move against this opposing pressure of the spring, to a position in which the. increase in pressure of said spring will counter-balance the pressure of fluid in chamber- 53. Upon a partial release of fluid pressure from chamber 53, the spring 5 8 will act to return the piston Eli and rod 5| to a position where the pressure of said spring is reduced to a degree equal to that of the reduced pressure of fluid, effective in chamber 53, while upon a full release of fluid pressure from chamber 53, spring 58 will return piston 59 to the position in which it is shown in the drawings. It will thus be ap-- parent that the piston 56 may be caused to as sume any position to the left of the position in which it is shown in Fig. 11 by providin fluid at the proper pressure in' chamber 53.

larger end portion 11 of which is disposed to slide in bore in. In this larger end portion 11 is an annular groove carrying a sealing ring 18 arranged to prevent leakage of fluid under pressure from a chamber l9 at its outer face to the space between said ring and the sealing ring 15, this space being constantly open to atmosphere through a passage =39 in plunger I 6 and a registering passage 8! which extends through stem 12 and is open to chamber 66 which is constantly in communication with the atmosphere by way of f passage 67. Chamber 19 located at the outer face of larger end portion ll of the plunger 16 is open to passage 54.

The end portion 13 of stem 12 disposed within bore 63, is provided with two spaced sealing rings s2 having sealing and sliding contact with the wall of said bore to prevent leakage of fluid under pressure past said rings from an annular recess 433 provided in the peripheral surface of the stem and located between the rings. open through a plurality of ports M to an annular recess in the casing and thence through a passage 86 to a pipe 81, at both of the adjusting The pipe 8'! is constantly supplied with motors. fluid under pressure from a source such as a con- 1 ventional locomotive main reservoir 88.

With piston 5B in the position in which it is shown in Fig. 11 the'lever 36 or 38 of the respective throttle valve device 34 or 35 will be caused to assume the steam cut-off position as shown in Fig. 2. The'piston' as it is moved out of the position in which it is shown in Fig. 11 will operateflever 3 6 or 38 to effect the supply of steam to the turbine 9 or l2, respectively, in an amount proportional to the degree of such movement. It will thus be apparent that the amount of steam admitted to'turbineH or 12 will vary in proportion to the pressure of fluid eifective in chamber53.' f

The pilot structure for controlling the pressure of fluid in chamber 53 comprises a flexible diaphragm ii i at oneside of which there is provided a chamber 62 to which is connected a control passage 63. The passage 63 in motor lls is connected to a control'pipe M, while in motor 4! said passage is connected to a control pipe 65. At the opposite side of diaphragm 6! there is pro vided a chamber 66 which is open to the atmosphere through a port El. The casing of this structure 55 is provided with bores 68 and 69. at opposite sides of and coaxially aligned with the diaphragm Bl. One end of bore 68 is open to chamber 66. The adjacent end of bore 69 is open to chamber 62 while its opposite end is open to a larger bore ill the outer end of which is closed byacapnut'll.

A stem '12 extending centrally through the diaphragm 6i and secured thereto for movement therewith has one end portion 13 disposed to slide In each of the throttle adjusting motors the recess 83 is also open to a counterbore 89 provided I in the portion 73 of stem 12. The open end of counterbore 89 is closed by a nut 99 having sliding engagement with the wall of bore 68 and also having screw-threaded engagement with the internal wall of counterbore 99 and thus the nut is secured to the stem 12 for movement therewith. The nut 90 has an axial bore one end of which is open to a chamber 9i at the outer end of the nut while the opposite end is open to counterbore 89 within the stem, and slidably mounted in this axial bore is a fluted stem 92 projectihg from a fluid pressure supply valve 93 contained in a counterbore 89 and arranged to seat against the adjacent inner end of said nut. A

precompressed spring 94 disposed in counterbore 89 acts onthe supply valve 93 for urging the valve tic its seated or closed position as shown in Fig.

The end of the supply valve stem 92 extends beyond the outer face of nut 90 into'chamber 9| and therein engages a release valve 95 which has a fluted stem 96 slidably mounted in a bore provided axially in a plunger 91 which is mounted to slide in a bore in the casing in coaxial relation with the end portion 13 of the diaphragm operated stem 12. In the peripheral surface of plunger 9? are two spaced recesses, in each of which is a sealing ring 98 having sealing contact with the wall of the bore for preventing leakage of fluid under pressure from one side of each ring to the opposite side. Between the two rings 98 the plunger Ell has an annular recess 99 which is open through one or more ports I09 to a bore l9! within the plunger and into which bore the end of the release valve stem 96 projects. The recess as is also open through one or more ports I02 to a recess H13 in the casing. The recess [03' A The recess 83 is 7 is in constant communication with the atmo'sphere 'throughapassage l04 and a fitting-I arranged-to prevent'entry'of insects, into said passage:

The outer-end of bore IIlI in plunger-'91 is closed 5 bya'plug 156 and between "the inner end of said plugandthe adjacent'e'ndof the release valve stern 95 there 'is interposeda precomprs'sed spring IiTI- for*urging the release valve- 95 out of seating'engagement with the end of the plunger 91. In'the outer endof plug I06 there is secured anadjusting-s'crew-i 08" and on said screw is a lock" nut Illii'ior contacting plug I06 to lock said screw in an-adjusted"position? The outer end of the l adjusting screw 38 bears against a'lever I I I], one end of which is mounted'to rock on a pin III which is mounted in a fixed arm H2 projecting from the casing. The opposite end of the lever is operatively'connected, exteriorly of the casing, to the power piston rod 5i by'means of a lug I13 '20 projecting from said'lever into an annular groove I I4 provided in said rod.

It will be noted that chamber 9| containing the release valve"95'is formed between the adjacent endsof the portion '13 of plunger I2 and plunger 91, and 'said chamber'is open to passage 54'leading'to chamber 53 at the right hand side of the powerpiston 58. The passage 54 is also open to chamber I9 providedat the outer face of plunger I5 as beforementioned and it is desired to point out that the enlarged portion IT or said plunger is of the same area as that of the nut 9Bp'rovided on the end'of portion "IS of plunger I2, whereby pressure of fluideffective' in chamber 9| tending to urge the structure including diaphragm'fil 'in '35 the direction of the right hand will be counterbalanced by 'an equal pressure of fiuidacting in the opposite direction in chamber "I9 on the enlarged'portio'n TI of the plunger'it.

Carried by the casing and"project'ing into 49 chamber 52 at the right hand side of diaphragm'fil is a" stopl I5 which is arranged to be engaged'by a plate I I6 secured to the stem [2 for limiting defiectidnj'of the diaphragm 6| in the direction of the right handfIf desireda' plurality or such stops may be provided. "In chamber 66 a precom"-' pressed control spring I ll encircles the stem'iZ. One endof this spring bearsa'gaiiist a wallo'f the" casing,lwhile the'opposite 'endbears againsta follower "I I8 which is provided on 'stem'i2 for engaging the adjacent face of "diaphragm BI; "This springf'I'I'I is operative to urge the diaphragm'fil to the position inwhich'it is shown in the draw ings upon release of fluid pressure from chamber 62yandto oppose movement of said diaphragm in the direction of the left hand upon supply of fiuidunc'ler'pressure'to said chamber, and to C0-- operate'withsuchpressure to define different po-" sitionsof said diaphragm." Preferably the spring l I'I'is precomp'ressed to a degree whieh'will move the diaphragm to the position'shown in the drawingagainst'fa relatively low pressure of fluid in chamber 52,such' as eight'poun'ds;

Each of the throttle"adjusting 'motorsfurther embodiesa'n insuringvalve device H9 comprising a" poppet'valve' IZI'I' contained in a chamber I2I' which is open to passage 5:3. The'valve I20 has a fluted'stemextending through a bore'into a chamber I 22 whichis open to vent passage I04," said'valve beingthus arranged to control com-' munication between passage 54 and I04,1ike'the release 'valve 95, but underdifferent' conditions as "will be laterbrought'out. A spring I23 "in chamber -'I2lacts'on'v'alve 'I20 for urging it to closedp'osition.

The fluted stem of valve' I2D' engages in cham r ber"-I22 a cylindrical stem 42a "which" slida-bly extends "through a bore'"'in a wall separating chamber I22 irom'a' chamber I 25" provided at one side of a piston I 26*"to "which the stem is connectedfl Chamber I25 fis open 1 to atmosphere" through" a passage I21,' and-at the opposite side of piston I26 is a pressure chamber I28 connected to passage -5'I.- a V The operation'of the forward and reverse throt tle adjusting motors 40 and' AI, by' reference to Fig. 11 will now be described." I

Let it be initially -a'ssun'ied- -thatthe pressure of fluid-"indiaphragmchamber 62 is reduced-'tothe lowdegreeof eight" pounds-above mentioned byway of passage-63 andpipei i or 65 '(Fig.'=2)." Under this condition spring II! will maintain -thediaphragm 6i and stem l2 in the position shown in Fig. 11 and the supply va1ve '93 will be' closedby'spring 94 to prevent flow of -fiuid -fro'mthe main reservoir 88 past said valve to chamber 9I.' Chamber SI and the connctedcha'mbe'r 'I9 and T chamber 53 at the right hand face of the power piston in will, underthiscondition," be substan'-' tially at atmospheric pressure "and the release valve will be seatedfor reasons which will be apparent from the description to follow.

Chamber 53 being substantially at atmospheric pressure, spring 53 will maintain the power pistbn""' 50 in the position'in which it is show'rrin the" drawings; Thus whenthe' pressure of fluid in diaphragm chamber GZis at substantially'eight pounds, the power piston 50 will actuate lever '36-- or 380i the respective throttle valve device or 35 to cut ofi the supplyof steam-to the respecuve'-=' steam turbine '9'or I2.

Let it now be assumed thatit is desired to supply steam to the forward turbine'll. To accom plish this, fluid under pressure will be supplied through pipe 64fto increase the pressure of fluid in chamber'62 in the throttle'adjusting motor 40, and this increased pressure, acting on one side of diaphragm GI; will overcome the opposing force of control spring I I1 and will cause said ('iiaphragm'to deflect in the dirctionbf theleft hand to a position where the increase in pressure of said spring will counterbalance'the increased pressure of fiuidi'n said chamber. As thedia-" phragm GI is thus moved, the portion I3 of stem I2 will move relative 'to and thus outof seating engagement 'with'the' supplyval've 93, since" the supply valve is held against movement by engagement with release valve' 95 which," at this time, is held against'movenient byplungei 9'| lever I It and a relatively great reluctance of the" power piston 50 to movement. p 7

Upon 'the opening'of the supply v'alve'93, fluid under pressure from the main reservoir 88, sup'-} plied through pipe 8! to bore 89 containing the" supply valve 93 will flow past said valveto chambei' HI and thence to chamber 53 at the right hand face 'of the power piston 50. When the pressure of fluid thus provided in chamber 53 becomes sufiicient to overcome the" opposing'f force of spring 58, the piston 50 wm move in the direction'oi the left hand." After movement of diaphragm 6| ceases in a position of said diaphragmbor'respondingto the' pressureof fluid'f' provided in chamber 62, as above describedfthis movement of the power piston 50 willact through lever IIB to allow movement of plunger 91 by 7 pressure of fluid effective in chamber 9| in a direction awayirom the nut m'and this movement of v said'plunger will permit movement of the supply valve'53 by spring 94 toward its seat. The suppi'y' 50 to atmosphere through passage I94.

'valvewill finallyengage its seat in a position of the power piston corresponding to the position of said seat as predetermined by the pressure of controlling fluid provided in chamber 62. When the supply valve 93 closes, the flow of fluid under pressure to chamber 53 will stop and hence movement of the power piston 59 will cease in a position corresponding to the pressure of fluid effective in chamber 62.

It will thus be seen that upon a certain deflection of diaphragm BI, as determined by the pressure of fluid provided in chamber 92, the power piston will adjust the respective throttle control lever 36 out of its steam cut-off position shown in Fig. 2 to supply steam to th forward turbine 9 in an amount proportional to the pressure of fluid provided in chamber 92 in excess of the initial eight pounds pressure effective in chamber 62.

' If the respective throttle valve device 34 is adjusted as just described to provide less than full steam supplyto the forward turbine, the supply of steam may be increased by increasing the presby the dot and dash line 31 for supplying the maximum amount of steam to the turbine.

On the other hand, if the operator desires to reduce the amount of steam supplied to the forward turbine 9 he will reduce the pressure of fluid in diaphragm chamber 62 to a desired degree. Spring II! will then move the diaphragm BI in the direction of the right-hand to a new position corresponding to the reduced pressure of fluid. As the diaphragm BI is thus moved toward the'right hand, it will carry with it the supply valve 93 and the supply valve stem 92, thus rendering spring I91 effective to move the release valve 95 with the supply valve and relative to the plunger 91 out of seating engagement with said plunger. Upon this opening of the release valve 95, fluid under pressure will be released from chamber 9I and thus from chamber 53 at the right hand face of the power piston I When the pressure of fluid in chamber 53 is thus reduced, the spring 59 will move the power piston 59 in the direction of the right hand. The piston as it is thus moved will operate the lever II9 to move the plunger 91 in the direction of the release valve 95. After movement of the diaphragm SI and release valve 95 ceases in a position corresponding to the reduced pressure of fluid in chamber 92, this movement of plunger 9'! will be relative to said valve and will finally effect closure of said valve to prevent further release of fluid under pr'essure'from chamber 53 so as to stop piston 59 in a position corresponding to the reduced pressure of fluid in diaphragm chamber 62. This movement of piston 59 will operate the throttle valve 34 to correspondingly reduce the amount of steam supplied to the turbine 9, as will be apparent.

If a further release of fluid under pressure from chamber 62 is effected, the power piston 59 will again move in the direction of the right hand to a correspondingly new position to effect a further and corresponding reduction in the supply of steam to turbine 9, in the same manner as just described. Howevenupon reducing the pressure of fluid in chamber 62 to its minimum degree, such as the eight pounds above mentioned, the diaphragm BI, supply valve 93 and release valve will return to the position in which they are shown in the drawings, whereupon the power piston chamber 53 will be maintained open to the atmosphere past the release valve 95 untilsaid piston reaches the position in which it is shown in the drawings, at which time, plunger 91 will seat against the release valve 95, and this operation of piston 59 will actuate the steam throttle valve device 34 to cut off all steam supply to the turbine 9.

It will now be seen that any desired amount of steam may be supplied to the forward turbine 9 by providing fluid at the proper selected pressure in pipe 94 while a reduction in-pressure'of fluid in said pipe to its normal minimum degree will effect the cutting ofi of the supply of steam to the forward turbine.

In a manner which will be apparent from the above description, it will also be seen that the supply of steam to the reverse turbine I2 may be varied as desired or may be cut oif by providing fluid at suitable pressures in the control pipe 65 for controlling operation of the reverse throttle adjusting motor I I.

In the operation above described, it will be noted that the cutting off of the supply of "steam to either the reverse or forward turbine, upon' release of fluid under pressure from chamber 53 in the respective throttle adjusting motor is dependent upon and effected by spring 58 acting on the power piston 59.

In order to positively ensure that the supply of steam will be cut oif to the non-operating turbine or turbines, i. e., to the reverse turbine 9 when steam is being supplied to the forward turbine I2, and vice versa, and to both turbines when it is desired to stop the locomotive or hold it stopped, particularly in case spring 58 in the respective throttle adjusting motor '49 or 4| should become broken fluid under pressure will be supplied through passage 51 to chamber 56 byrneansto be later described, which will act to move the piston 59 to its steam cut-ofi position, in which it is shown in Fig. 11, with the fluid pressure released from chamber 53. To ensure the release of fluid pressure from chamber 53 under such conditions, even though spring I I1 actin on'the diaphragm 6| or spring I9'I acting on the-release valve 95 should fail or become brokeny which would prevent opening of the release valve 95, the ensuring valve piston I26 will be operated by fluid pressure supplied to passage 51 to unseat valve I29 so as to thereby open chamber 53 to atmosphere through the communication-by-passing said release valve. During operation of the throttle adjusting motors 49 and II for supplying steam to the respective turbines, spring chamber 56 and piston chamber I28 will be'open to atmosphere and as a result the insuring valve I29 will be closed. The selective control of the forward and reverse throttle adjusting motors 49 and M and of the clutch control cylinder 22,in accordance with the desired direction of movement and stopping of the locomotive, is arranged to'be controlled by an operators control valve device I29. The control device I29 comprises a body portion I39 which is mounted on one face of a pipe bracket I3I, a throttle adjusting motor selector valve portion I32 which is mounted on another face of said bracket, and a cover I33 which is mounted on the body portion I 39. 1|

"rtJI'he-bodyportion I 30 carriesra hollow rockashaft 2-: 345suitably journalecl ate-opposite;endssyand'se wcuredsragainst .--longitudinal movement, 14: and .mounted. toslide within said rocl 1shaft -;longi- I .itudinally thereof is a plunger, I35; i'Adiacentone .-.-;.e'nd the rock shaft is provided through oneside rim-with aslot, and. the plunger I35rhas an aligned through. slot,- and extendingthrough. the slot. in r-Qthe rock shaft. and, intotheslot in-theplunger is n. endportion I 36 of anoperatorscontrol lever rf 3'I.-.'-I'he rock. shaft 134 is provided ateitheinside ofeits, slot with spaced;upstanding-ears 838.: be-

tween which the portion I36 of thegoperators '-;-control lever isdisposed1 Extending through the ends of the earsrI3B and throughthednterposed portion of the. control lever I3! is a pivot @pinaI 39 i. .for: said lever usaidlpin being arranged at; right rmangles to the-axis ofithe rock shaft. In ;the.inner end of the, portion? 136 of themperatorscontrol lever is a recess in which iszdisposed a pinoMIl -.-:-r which is secured in plunger; l3szwi-By'this struc- 1511111138 it will be seen that movement of-:the.-iopert-aators' oont'rol-i lever- I3I.about pin 139' inzthc 1 direction ofathe length of. rockhshaft I34g-will -move the plunger 435 longitudinally in fsaidrocl: shaft, while movement of vthe'lever in a direction circumferentially of the rock shaft will turn said 2 shaft and plunger incunison. 1

cover I33 is provided-with a slot through which the operators control lever 131 lexte'nds 'a nd which is. adapted to define thespath of. movement I OfiSflidl lever. This slot comprises central; 1301- r .tion 'I 4 I Y which extends parallel. tothe direction of the length of the rock shaft "1,34,53X1dh3v150 iiroomprises two oppositely 'extending portions I42 ;-..;and I 43 which-are arranged at right angles: to lithe central portion-I4I and which..open:respec- .-tivelyto opposite ends of said-centralportion.

of The operatorscontrol lever I31 has a neutral .po sition midway between the ends of: the -central .xaportion I41 of the slot; inwhichxposition:said

lever isshown in the diiT-erentviews of thedrawings?" The lever I3! is movable in.one direction from neutralix position to what may; beccalled 'a forward selection. position at the junction on :-:the' parts I M and .142 ofnthe-slot and-then to a -:-.1st0pf*. position a slight. distance into thezslot .1142 i from the (forward selection -positionr- At the opposite or outer'end of1the-portion'442 of'.the=slot tithe leverr'l3l :has afull steam position; the .range' of. movement of .the lever :betweenithe :-.stop.. position and the full steamiipositioncon- 5 stituting a. speed. control range or {zone and providing for varying the supply of steam to the for- .rw-ard turbine 9 from, respectively, a,-- minim um amount to a maximum amount; "I'hgminimum :camount is; less than-required to causeopet'ation of .theforward turbine 9 to propel the locomotive ----1and isisubstantially equal to theisteam slip:in-' .the -;i.turbine so as to maintain the turbine warm ,when ea. stopped in order that itiwill. be irncondition to c-goperatezzeflicientlyi when required for propulsion.

The lever I3! has at the oppositeuendw of the 7' portion .I4I of the slot a reverse selection? position and in the portion I 43 of the slot .stopfand affullisteamfpositions for controlling the reverse i;.-.turbine I 2,: the space between said 'fstop. and

"fl-ffullsteam positions constituting asteam vary- ;ing range for said turbine, and. the stop posiotion'also providing for-supply of steam to the reverse-turbine equal substantially to the turbine slip for the same reasons as above set forth in connection with turbine 9. Inportion I4I of the -:--i slot'allsteam to the-turbines will be 'cut off as will be described in greater detail. hereinafter.

These: d-ifierentzpositions, of dever I 3 I. are indicated in Fig. .3 byappropriate legends; there.- also being shown thelegend: forward at .thezremote end of the portion I42 of the slot and the legend freverse at, the'opposite end of the. portion I43 of the.slot,whichlast two mentioned. legends indicate thev directions of movement of the lever from I neutralj position for. obtaining ahead or reverse operation of the locomotive.

As shown in Figs. 1 and 9 ,theoperators; control'lever-I3'I within the Q0ver;--I33,comprises a rod: I44 and, outside of the cover, comprises a ;.hand gripportion--I45,which is securedgto'said I rodrbyscrew-threaded engagement; and by a set .;scre w I46, Slid ably mountedgonthe rodbetween the hand grip. portion I45 and the cover, is a-detent, I41, andwcarried withinethemand grip-pore tionand acting. onsaid detent isa precompressed spring I48 urging said detent against-said. cover. Asshown in Figs. 1, 3;;and 9 the-cover is'pro- Each otthe portions I42- and I43 of the guide slot is provided with an & enlongated recess I 5 0.;which is. adapted tosreceive the .detent I4'Iaand; which provides -=for relatively.free movement of the op- ;eratorscontrol lever between. .the -.stop, x and .the.-.ful1steam, positions the detent-being operative however to prevent unintentionalmovement from either.-sjtop position to the adjacent "forward selection; position: or -reverse selection" position.

The red. I 44. is prouided with acounterbore extending-from-the outer end; oi the operators control level; to-a point -w ithin the-coves I33; and ---slidably mounted;withinwthisgbore; is a plunger ISI. -One end of-plunger; I5[ is disposedgadjacent the inner. end ofthe. cou-nterbore andon the opp osite end of the plunger? there is secured a I @finger. operated cap I52 which projectsybeyond .the outerend ofathe' handegrip portion I of thelever whereby: the plunger. maybe. moved inwardly ofwthes rod- I 44 ;by, pressure fromg an .operatorsfingen. A double detent I53 isslidably mounted on -the .rod I 44- within the cover. .l 33,

1 and a, springs; 54,. encircling, said remand-supported on a..co1lar..I55-,secured tosaid rod-acts on. said detent urging same. in. the directionof the-.inner surface of the .-cover. This-detent is connected. by a pin-J56 to theplunger I5I said -.pin extending through suitable .oppositely arranged slots: 15'! inI-the rod-144,; These-slots are .so arranged as to beengaged at-oneendbypin ..I5 6 to limitupward movement of..the. detent 1153 {tion awayfrom the inher t-surfaceof-.-.-the,- cover 6 lbyzmanual operation of said plunger.

I-The detent I53 is provided, on the. side of.,-rod I44 .Which is adjacent-the portion I42 0f.-the' slot,

Y with a plunger J58 which is: urged in thedirec- .;tion of the inner surface of the cover by a spring 159.. A like spring pressed;-plungen I60 is pro- Iv 'vided in the-detent at.,.the.opposite-side ofrod .444. :Along-theinner surface of the; coverand adjacent opposite sides of the pOI'tiOn IIIZ of the slotare two gear. toothedracks -.I6I andI 62 which extend between the-.stop and full steam posisteam supply-position within; this part of=..the

slot 1 ppos yar ang d-t thed ec aim-e H 13 I64 are provided along the opposite sides of the portion I43 of the slot between the stop and "full steam positions for cooperation with plungers I58 and I66 respectively, to secure the operators control lever in any selected position within this part of the slot. It will be seen that the plungers I58 and I60 may be released from the respective racks by moving plunger II inwardly by manual pressure applied to the cap I52 projecting from the outer end of the hand grip portion I45 of the operators control lever.

The teeth in each pair of racks I6I, I62 and I63, I64 may be arranged in staggered relation, so that when plunger I58 enters a space between two teeth on the respective rack I6I or I63, the

plunger I66 will be engaging the end of a tooth 1 I on its rack I62 or I64, and vice versa, whereby the operators control lever I31 will have a number of positions along each pair of racks equal to the sum of the spaces between the teeth on the pair of racks. Inorcler to allow movement of one of the plungers into a space between teeth on its rack under the action of spring I54 when the other plunger engages the end of a tooth on its rack, the respective spring I59 acting on the other plunger will yield.

If desired, however, the teeth on each pair of racks may be aligned with each other so that the plungers I58 and I60 will at the same time enter recesses in the respective racks. In such a structure the number of positions of the operators control lever will equal only the number of recesses between teeth on one rack. By this arrangement the springs I59 could be dispensed with and the plungers I58 and I60 could be secured against movement in the detent I53 and might, if desired, be made integral parts of the detent.

Associated with the body portion I30 of the operators control valve device is a forward steam cut-off valve device I65 and a reverse steam cut-ofi valve device I66.

The forward steam cut-oif valve device I55 comprises a supply valve I61 which is contained in a chamber I68 and which is connected by a stem I69 to a plunger I10 slidably mounted in a suitable bore in the casing. The casing has an annular recess encircling the plunger I10 and containing a sealing ring I1I having sealing and contact with its seat. The supply valve I61, stem I69 and plunger I16 are provided with an axial "bore which is open at one end to chamber I63 7 and which is open through a valve seat at the opposite end to chamber I13 which contains a release valve I11 arranged to cooperate with said seat for controlling the release of fluid under pressure from chamber I68 to chamber I13. The

release valve I11 is carried by a stem I13 which is disposed directly below the axis of rock shaft I34.

The shaft I34 is provided with a cam I19 arranged to contact the release valve stem I18.

The cam I19 is so designed as to eifect movement of valve I11 into contact with its seat and to l; 14 1 then act through plunger I16 and stem I69 to move the supply valve I61 out of engagement with its seat, with the operators control lever disposed in the portions I4! and I43 of the slot, and to permit the closing of the supply valve I61 by spring I16 and the opening of the release valve IT! by pressure of fluid from chamber I68 with the operators control lever in any position between and including stop and full steam positions in the portion I42 of the slot.

Chamber I12 is arranged to be constantly supplied with fluid under pressure from a fluid pressure supply pipe I66 while the locomotive is in use. Chamber I68 is connected to pipe 59 which leads to spring chamber 56 in the forward throtle adjusting motor 41]. It will thus be seen that with the operators control lever I31 in any position between and including the stop and full steam positions in the portion I42 of the slot, which provides for control of the forward throttle adjusting motor 46, the spring chamber 56 in said adjusting motor 46 will be open to atmosphere to provide for operation of said motor by fluid under pressure supplied to chamber 53 for controlling the steam supply to the forward turbine 9, while in all other positions of said lever, fluid under pressure will be supplied to spring chamber 56 in the forward throttle adjusting motor to insure operation thereof to cut-off the supply of steam to the forward turbine 9.

The reverse steam cut-off valve device I66 is structurally identical to the forward steam cutoff valve device I65 and comprises a supply valve Illl contained in a chamber I82 which is connected to pipe 66 leading to the reverse throttle adjusting motor 4i, said valve being arranged to control the supply of fluid under pressure from a chamber I33 to chamber I32, the chamber I83 being constantly supplied with fluid under pressure from the supply pipe I60 by way of chamber I12. The reverse steam cut-off valve device further comprises a release valve I84 and an operating stem I85 arranged to cooperate with a cam I66 on the rock shaft 534. The cam I86 is formed just the reverse of cam I 19 so that with the operators control lever in the reverse speed control zone, that is to say, in and between the stop and full'steam positions in the portion I43 of the slot, the spring chamber 56 in the reverse throttle adjusting motor 4I will be open to atmosphere to provide for adjustment of said motor by the pressure of fluid in chamber 53, while in all other positions of the operators control lever the reverse steam cut-off valve device I66 will act to supply fluid under pressure to spring chamber 56 in the reverse throttle adjusting motor 4| to insure operation thereof to cut-off the supply of steam to the reverse turbine I2.

The forward and reverse cut-off valve devices I65 and IE6 will thus act to ensure the cutting off of steam to both turbines when the controlling lever is in the central portion I4I of the slot, and will ensure that the supply of team to the reverse turbine I2 will be cut off when the operators control lever is positioned for supplying steam to the forward turbine 9 and will ensure that steam will be cut-off to the forward turbine when the operators control lever is positioned for supplying steam to the reverse turbine.

The throttle adjusting motor selector valve portion I32 of the operators control valve device comprises a forward selector valve device I81 for controlling communication between pipe 64 from the forward throttle adjusting motor 46 and a passage I88, and also comprises a reverse selector valve.- deyice I 88 fo1= ;entrolling communication etween said passage and pipe 65 leading to the reverse-throttle adjusting motor M, the passage 1- 488 leading to raped-lapping speed control valve deirice; I98 also forming a part of the operators r c on-tro1 valve device I 29.

" Theforward selectorv valve device I81 comprises :a plungerl 9i which is slidablymounted in a suit- -;;.able bore in; the'casing and which-has at one side a chamber I82 connected to passage I38, and

. -which has atits opposite side a chamber I83 ,vhich isopen to atmosphere through a passage I94, .a .chamber; I85 and an insect excluding de- -,:.-vioe J98; The plunger I9I is connected by a stem -.I9'I to a fluid pressure supply valve i953 which is 7 contained in a chamber 99, said stem extending ,threugh-anopening in a wall 2m] separating said .11.: chambers; In chamber: .589 the wall 288 is pro- ..--:.-vided' with a-seatwhich extends around the pen- .ingtherein for engagement by the supply valve;

I98... A.-spring,2lll in chamber I98 acts on the valved 88;fo r-urging the valve to its closed position as shown in the drawings.

provided with an axial bore 282 open at one end to chamber I99 and at the opposite end to cham ber. I93. Inchamber E93 the plunger I9! is provided-with a seat which extends around the bore :.:282, for engagement by a release valve 283. L0-

cated above the release valve 283 is a plunger 234i;

..- which is slidably mounted in the casing in co- ..axial relation with said valve and with plunger -1-uI9I. The plunger 282 is subject on its lower face a to .the pressure of fluid in chamber I83 plus the er-pressure of a spring 285, and is open at its upper;

:-.- face to chamber .206.

:When fluid under pressure is supplied to chambcr205i, in aimanner which will be later described,

the plunger; 284 will move against the opposing 1; force of, spring 205 and seat the release valve 283-. against theplunger Illl for closing communication .betweenchamber I83 and chamber I93.

--Plunger.- 204 when further moved by fluid preslease of. fluid under pressure from chamber 285i r the springrZDS will act to return plunger 283 to the position in which it is shown in the drawings to allow ,the closing of the supply valve I88 by spring 28I and the opening of the release valve ---203- by the-pressure of fluid eiiective in bore 282- a 50 as to:release.fluid under pressure from cham- [ber 62 in theforward throttle adjusting motor 48 past said release valve to atmosphere.

--The reverse throttle selector valve device I89 is structurally identical to the forward throttle selector valve device I81 and briefly described, comprises a supply valve 201 for controlling flow of fluid underpressure from a chamber 208, which is open through chamber I82 to passage I88, to a chamber. 209 which is connected to pipe 65 leading to diaphragm chamber 52 in the reverse throttle adjusting motor II. The reverse throttle selector valve device further comprises a release valve 2I0 which is contained in chamber I 95, and a which is for the purpose of releasing fluid under pressure from the reverse throttle adjusting motor 4I.by way of chamber 289. The device also comprises a plunger 2 which is arranged to operate in response to the supply of fluid under pressureto a chamber 2I2 toclose the release -va lve 2I0 andopenthe supplyvalve 281. {7pm the release of fluid pressure from chamber 2I2 a sprin 2 I3 will return the plunger 2I I to the position in which it is shown'in thedrawings to permit the closing of the supply. valve 201. by a spring ZI l and theopeningof therelease valve M8 by the pressure of fluid from chamber 289, so

. as to thereby open pipe 65 and diaphragm chamber 62 in the reverse throttle adjusting motor 4| to atmosphere.

The plunger chamber 206 is connected toapassage 2I'5,-and the plunger chamber. 2I2 iscon- ,nected to a passage 2I6. Thepassages .2I; and

2H5 leadrespectively to forward and reversedirectional control valve devices 2I.l and 2L8 in a direction selector portion 2I9 of the operator's control valve device I29.

, The forward directional control valve device 2Il comprises a. plunger220 which is slidably mounted in a bore inthe casing-and which is connected by a stem 22I to a supply valve 222 contained in a chamber. 223. The stem 22I ex- .tends through .a chamber 224 formed atoneside of plunger 22.0 and alsothrough a bore provided in a wall 225 which separates said chamber from chamber 223, said wall being provided around .7 said bore in chamber 223, with asset for engageand plunger, 220 are provided, with an axial bore .open atone end to chamber 223 andopen atthe ment byrthe supply'valve, 222. A spring 226 in chamber 223 acts von the supply valve 222. for urging it to its seat. The supply valve 222,v stern 22I oppositeend, through a valve seat, to a cham ber l 22? whichisppen to atmosphere through aport 223. A re1easevalve-229 containedin chamber .227 is provided to. engage a. seat on the end of plunger. 228 for: closing communication through the bore in said plunger. Chamber 224 is [open to a passage. 230 which is adapted tobe constantly, supplied with, fluid, under. pressure from v the fluid pressure supply pipe. I80. -Qhamber 223 is connected to passage 1 2I5 leadingto plunger chamber 205 in the forward throttleselector valve device. I67. The release valve 229 is carried by a stem 23 Irwhich isslidably mounted in the casing andwhichextendsAbeyond an exterior surface thereof.

. The reverse directional control valvedevice 2 I8 is structurally identical to the vforward directional control valve device 2|! andbriefly described, comprises a supply valve. 232 which is contained in a chamber 2-33..and.which is arrangedto be seated by the pressure ofta spring 234.- The. supply valve is connected by a stem 235 whichextends through acham ber' 236110 a plunger 231 at the outer .face of which plunger is a chamber 238 open to atmosphere through a port 239.. A

releasevalve 248-which is contained in chamber 238 is arranged to..cooperate witha seat provided on the adjacent end ofplunger 231 for controlling the release of fluid under. pressure from chamber- 233 to atmosphere byway ofchamber 238. The release valve 248.,has a s tem 24 I,;;ex-

'tendingthrougha bore in the casing andbe yond an exteriorsurfacethereof. The chamber .236 is supplied with fluid under pressure from pipe "I88 by way of'passage 233 .and chamber224.

' Chamber 233 is. connected to passage 2I6'1eading to plunger chamber M2 in the reversenthrottle selector valve device I88.

The two release valve stems 23I and Z IIYare arranged in spaced parallel relation with respect to each other and to the axis of the plunger I35 which ismounted to slide in rock shaft -I 34. The

release valve stem 23I is engaged by one end of a. lever 242 which, substantially midway between its ends, is fulcrumed on a pin 243 mounted in a bracket 244 projecting from the casing of the device. The opposite end of lever 242 is disposed in a recess 245 provided in plunger I35, so that longitudinal movement of said plunger will rock the lever 242 about the fulcrum pin 243. The release valve stem MI is engaged by a lever 246 substantially midway of its length. One end of lever 246 is fulcrumed on a pin 241 provided in a bracket 248 projecting from the casing, while the opposite end is disposed in a recess 249 provided in the plunger I35 so as to move with the plunger upon longitudinal movement thereof.

With the operators control lever I31 in neutral position, as shown in Figs. 1 and 3 the levers 242 and 248 will be positioned to permit the opening of the release valves 229 and 240, respectively, and the closing of the supply valve 222 and 232, respectively, so as to thereby release fluid under pressure from plunger chambers 286 and H2 in the forward and reverse selector valve devices I81 and I89. The release valves i203 and 2H] in the later devices will therefore be open and the supply valves I98 and 201 will be closed so that diaphragm chambers 62 in the forward and reverse throttle adjusting motors 48 and 4| will be opened to atmosphere. Thus with the operators control lever in I neutral position the power piston chambers 5'3 in the forward and reverse throttle adjusting motors 48 and 4|, will also be open to atmosphere to permit the power pistons 50 in said motors to occup their steam cut-off positions as' shown in Fig. 11 to thereby cut-off the supply of steam to the forward and reverse turbine 9 and I2, respectively.

The operators control lever I31 when moved to the position designated by the legend "forward selection in Fig.3, will move the plunger I35 longitudinally in the direction of the left-hand to thereby actuate the lever 242 to close the release valve 229 and open the supply valve 222 in the forward directional control valve device 2I'I. Thus, in this position of the operators control lever, fluid under pressure will be supplied from the supply pipe I'iifl to passage 215 and thence to plunger chamber 285 in the forward selector valve device I81 to thereby actuate said device to establish communication between passage I88 and pipe 54 leading to the forward throttle control mo- .tor 48. In this fforward selection position of the operators control lever I31 it will be noted that the parts of the reverse directional control valve device 2I3 will remain in the position in which they are shownin Fig. 1 for opening plunger chamber .2I2 in the reverse selector valve device I89 to :atmosphereso that the later device will be conditioned to open pipe 65 and thereby diaphragm chamber 52 in the reverse throttle adjusting motor'4I to atmosphere in order that said motor will operate to cut-off the supply of steam to the reverse turbine I2.

The condition just described of the forward and reversedirectional control valve devices 2" and U8 is obtained in the forward selection position of the operator control lever and is then maintained as long as said lever is at this side of neutral position and consequently during the adjustment of the lever in the portion I42 of the lever guide slot.

Now if the operators control lever I31 is moved from neutral position to the position indicated by the legend reverse selection in Fig. 3, the plunger I35 will be moved longitudinally in the direction of the right-hand as viewed in Fig. l and 18' the lever as it is thus moved will actuate lever 246 to close the release valve 238 and open the supply valve 232 in the reverse directional control valve device 2I8, whileallowing the parts of the forward directional control valve device 2 I 1 to remain in the position in which they are shown in Fig. 1. As a result, fluid under pressure will be supplied from passage 233 to passage 2I6 leading to plunger chamber 2 I2 in the reverse selector valve device I89. The later device will then operate to open communication between pipe I88 and pipe 65 leading to diaphragm chamber 62 in the reverse throttle adjusting motor 4I. Under this condition the parts of the forward selector valve device I81 will remain in the position in which they are shown in the drawings for opening pipe 64 and thereby diaphragm chamber 62 in the forward throttle adjusting motor to atmosphere. This condition of the forward and reverse directional control valve devices 2|1 and 2I8will be maintained as long as the operators control lever is at the left-hand side of neutral position, as viewed in Fig. 3, and therefore during ad justment of said lever in the portion I58 of the guide slot. 2 I

The self-lapping valve device I90 may be of any suitable type arranged to supply fluid at various degrees of pressure from a chosen minimum pres-- sure to a certain maximum degree. For illustration, the self-lapping valve device may be of the type comprising a control plunger 258 and valve means (not shown) controlled by said plunger and operable to provide in passage I88 fluid at a pressure proportional to the degree of displacement of said plunger from a normal position, such as shown in Fig. l, and operable in the normal position to reduce the pressure in passage I88 to a chosen minimum pressure such as eight pounds. Fliud under pressure for supply to pasvalve device is admitted to said device through passage 230 which is connected to the fluid pres-- sure supply pipe I before mentioned. For controlling displacement of plunger 258 from its normal position as shown in Fig. 1, the rockshaft I34 is provided with a cam 25! having two identi cal but reversely arranged and spaced cam portions 252 and 253 on the peripheral surface of the cam. The peripheral surface of the cam is operatively connected to plunger 258 through a ball-like end 254 of an arm 255, the opposite end of which arm is mounted to rock about a fulcrum 258 provided in the casing.

With the operators control lever I31 in neutra position or in either of the forward or reverse selection positions, the cam 25I provides for movement of the plunger 258 to its outermost or normal position in which the self-lapping valve device I will operate to provide fluid at a minimum pressure of eight pounds to the control passage I 88. Movement of the operators control lever to either stop position is adapted to cause operation of cam 25I to effect operation of the self-lapping valve device I98 to supply fluid at a certain greater pressure such as ten pounds to passage I88, which pressure, effective in diaphragm chamber 82 of theforward or reverse throttle adjusting motor 48 or 4| in a manner which will be later described, will actuate said motor and thereby the respective throttle valve .34 or 35 to supply the hereinbefore mentioned minimum amount of steam to the respective turbine 9 or I2. I

The operators control lever when moved in the portion I42 of the slot from the stop position to the full steam position will cause operation of cam I to effect displacement of plunger 250 into the self-lapping valve device I90 an amount proportional to the extent of movement away from stop position to thereby provide in passage I88 fluid at a proportional pressure. A maximum pressure of fluid such as sixty-five pounds will be obtained in passage I88 upon movement of the operators control lever in portion I 42 of the slot to the full steam position. Adjustment of the operators control lever in the reverse direction in the portion I42 of the slot willcause the pressure in passage I88 to reduce in proportion to the distance the lever is out of the stop position, while the return of said lever to the forward selection position will cause operation of the self-lapping valve device to reduce the pressure of fluid in passage I88 to the minimum pressure above mentioned.

Ina like manner the pressure of fluid in passage I88 will be varied in accordance with adjustment of the operators control lever I31 in the portion I43 of the slot, as will be apparent.

Pressure chamber 28 in the pneumatic clutch control cylinder 22 is connected throughpipe 29 to passage 2I6 in the operators control valve device for control by operation of the reverse directional control valve device 2 I 8.

The operation of the apparatus as so far described will now be set forth.

Let it be initially assumed that the operators control-lever I3! is in neutral position effecting operation of the forward andreverse directional control valve devices 2Il and 2I8 to open the plunger chambers 206 and 2 I2 in the forward and reverse selector valve devices I81 and I89 to atmosphere. The forward and reverse selector valve devices I8! and I89 will thus be conditioned to open pipes 64 and 65 and diaphragm chambers 62 in the forward and reverse throttle adjusting motors 40 and M to the atmosphere to cause a complete release of fluid under pressure from the power piston chambers 53 therein. The power pistons 50 in the forward and reverse throttle adjusting motors will therefore be positioned as shown in Fig. 11, under the action of springs 58, so that, the throttle valves 34 and 35 are in position to cut-off the supply of steam to the forward and reverse turbines 9 and I2, 50 that the locomotive may be stopped.

Further, with the operators control lever I37 in neutral position the forward and reverse steam cut-off valve devices I65 and I66 will be conditioned as shown in Fig. 1 for'supplying fluid under pressure from the supply pipe I88 to pipes 59 and 68 leading to spring chambers 56 and to the ensuring piston chamber I28 in the forward and reverse throttle adjusting motors 48 and 4|, respectively, to ensure that the pistons 59 in said motors will be occupying their steam cut-off positions as shown in Fig. 11.

Moreover with the parts of the reverse directional control valve device 2I8 in the position as shown in Fig. 1, pressure chamber 28 in the clutch control cylinder 22 will be open to atmosphere by way of pipe 29 and passage 2I6 to permit operation of piston 23 by spring to disengage the movable element 21 of the clutch from the fixed element 20 so as to disconnect the reverse turbine I2 from the forward turbine drive shaft 8.

Let it now be assumed that forward movement of the locomotive is desired. To accomplish this, the operator will move lever I37 from "neutral position first to the forward selection position, to thereby actuate the forward directional 'control valve device 2" to supply fluid under pressure to passage '2I5' and thence toplunger chamher 296 to operate the forward selector valve device I8l to open communication between passage I88 from the self-lapping valve'device I98 and pipe 84 leading to the forward throttle control motor 69;

The operator will then move the control lever I37 from the forward selection position to the stop position in theportion I42 of the slot. The lever as it is thus moved to stop position will actuate the forward steam cut-off valve device I65 to release fluid under pressure from spring chamber 56 and. the ensuring piston chamber I28 to permit closure of valve I29 in the forward throttle adjusting motor 49 and at the same time will actuate the self-lapping valve device I to supply fluid to passage I88 and through the forward selector valve device I81 to pipe 64 and thence to the diaphragm chamber 82 in the forward throttle control motor 40 at the pressure, such as ten pounds, sufficient to cause operation of said motor and thereby of the throttle valve 34 to supply steam to the forward turbine 9 in an amount insufficient to cause operation of the turbine but which will provide for heating thereof as hereinbefore described.

Movement of the lever I31 past stop position in the direction of full steam position in portion I42 of the slot will then cause operation of the self-lapping valve device I90 and thereby of the forward throttle adjusting motor 40 and throttle valve 34 to increase the supply of steam to the forward turbine 9 in an amount proportional to the extent of movement of the lever away from stop position, to thereby cause operation of the forward turbine to drive the locomotive axle I and the locomotive at a proportional speed.

Further movement of the operators control lever in the direction of full steam position in the portion I82 of the slot will provide a corresponding increase in the amount of steam supplied to the forward turbine 9 and thereby by a proportional increase in the speed of the locomotive while movement of said lever to full steam position will cause operation of motor 49 and throttle valve 34 to provide a maximum amount of steam to the forward turbine 9 to obtain a maximum forward speed or output of power from the turbine for driving the locomotive in a forward direction.

If the operator should desire to reduce the speed of the locomotive he may move the control lever I3! in the direction of stop position and the forward throttle adjusting motor 40 will operate to adjust the throttle valve 34 to correspondingly reduce the supply of steam to the forward turbine 9. Return of lever I3! to stop position in the portion I42 of the slot will reduce the supply of steam to the forward turbine to the minimum amount which is insufficient for causing operation of the turbine as before mentioned.

It will thus be seen that by suitable adjustment of the operators control lever in the portion I42 of the slot between the stop and full steam positions any desired degree of speed or output of power from the turbine 9 may be obtained for propelling the locomotive in a forward direction, it being noted that during this operation of the forward turbine 9, the reverse turbine I2 is maintained non-operative and disconnected from the locomotive axle since the parts of the reverse directional control valve device 2 I8, reverse selector valve device I89, reverse steam cut-off valve device I68 and thereby the reverse throttle adjusting motor 4| remain in the positions in which they are shown in the drawings with the 21 operators control lever at the forwardselection side of neutral position.

In order to provide for the stopping of the comotive from movement in a forward direction, the operator need only return the lever to stop position adjacent the forward selection position to thereby render the forward turbine 9 non operable, as will be apparent.

If the operator desires to move the locomotive in the reverse direction he will move the control lever I31 to the reverse selection position for thereby operating the reverse directional control valve device 2I8 to supply fluid under pressure to passage 2I6 and thence to plunger chamber H2 in the reverse throttle selector valve device I69 for actuating the latter device to connect pipe 65 from the reverse throttle adjusting motor M to passage I68 leading to the speed control valve device I96. Fluid under pressure supplied to passage 2I6 will also flow through pipe 29 to the clutch control cylinder 22 to actuate piston 23 therein to move clutch element 2| into driving engagement with element for connecting the reverse turbine I2 to drive shaft 8.

- The operator may now move lever I3! from the "reverse selection position to stop position in the portion I43 of the guide slot and this movementwill effect operation of the reverse steam cut-off valve device I66 to open spring chamber 56 and piston chamber I28 to atmosphere and to permit closure of valve I20 in the reverse throttle adjusting motor 4| and at the same time will cause operation of the self-lapping valve device I90 to supply fluid to passage I88 and through the reverse selector valve device I69 to 1 diaphragm chamber 62 in the reverse throttle adjusting motor M at a pressure to cause operation of said motor and thereby of the throttle valve to supply steam to the reverse turbine I2 at a pressure insufficient to cause operation of said turbine but sufficient for heating same as before described. Suitable adjustment of lever Iil in the portion I43 of the slot between the stop and full steam positions will then cause operation of the reverse throttle adjusting motor ii and thereby of the reverse throttle valve device 35 to cause operation of the reverse turbine I2 at any desired speed or degree of power output and the locomotive may be stopped upon return of the operators lever to the stop position for rendering the reverse turbine non-operative, as will be apparent from the previous description.

It is however desired to point out that with the operators control lever at the reverse selection side of neutral position, the parts of the forward directional control valve device 2 II, the forward steam cut-off valve device I65, the forward selector valve device I81 and the forward throttle adjusting motor 46 will remain in the positions in which they are shown in the drawings rendering the forward turbine 9 non-operative during operation of the reverse turbine I2 to propel the locomotive in reverse. However, since the forward turbine 9 is at all times connected to the 10- comotive axle I, its rotor (not shown) will turn 'a desired degree, the rate of acceleration of the locomotive in a forward direction. The come munication containing check valve 258 permits a more rapid rate of release of fluid under pressure from the forward throttle adjusting motor to obtain a rapid cut-off of the supply of steam to the forward turbine 9. For the same reasons a choke 259 and by-pass communication containing a check valve 266 are provided in pipe 65 leading to the reverse throttle adjusting motor 4].

It is desired that the turbines 9 and I2 never be used for braking the locomotive. In other words, with the locomotive running backward steam must not be supplied to the forward turbine 9 which would tend to cause operation of said turbine to oppose movement of the locomotive. Likewise, with the locomotive moving for wardly, steam must not be supplied to the reverse turbine I2 at a time when said turbine would be connected to the locomotive axle.

In order to thus prevent the supply of steam to the reverse turbine I2 when the locomotive is moving forwardly, or to the forward turbine when the locomotive is moving rearwardly it is there'- fore essential to prevent movement ofthe operators control lever I3l into the portion I43 of its guide slot under the former condition, or into the portion I I-2 of said slot under the latter condition but is desired that under either of these conditions the lever be capable of movement to,"neu' tral position.

For thus controlling movement of the opera,- tors control lever I31, a pin 26I, secured at one end in the body portion I 260i the operators control device, projectsupwardly into the cover I33, and pivotally mounted on the other end of this pin within said cover is a rockable and shiftable interlock member or stop 262. The member 262 has a slot 263 through which the pin 26I extends and which provides for movement of the member in a direction either toward or away from the operators control lever I31. At one end of member 262 is a finger 264 which, with said member in the position in which it is shown in Fig. Band with the control lever I31 in its neutral position, is movable past one side of said lever to a position for holding said lever against movement from neutral postion to the reverseselection postion and thus into portion I43 of the slot. With the member 262 shifted to the right on pin 26I (Fig. 8) an amount governed by thelength of slot 263, the finger 264 will be so disposed as to move past the rightehand side of the operators control lever I37 when in neutral position to prevent movement of the operators control lever to the forward selection position and into the portion I42 of the slot. It will be noted that with the finger 264 disposed at the left-hand side of the operators control lever I31 to block movement of said leverin the direction of the reverse selection position, said lever may still be moved at will from neutral position to the"forward selection position and into the forward control portion I42 of the slot, while with said finger disposed at the opposite side of the operators control lever for blocking same against movement to the forward selection position, said lever may still be moved at will, from neutral position in the direction of the reverse selection position.

A bell crank 265 is rockably mounted on a #pin 266 disposed under the interlock member 262, and this crank has one arm26l, theend of which is disposed in a slot 268 provided in the .end of the member opposite the finger 264. Rocking of the bell crank 265 will rock member 262 f or moving the finger 264 in the direction toward or away from the path of movement of the operators control lever I31. The bell crank 265 has another arm 269, and between the end of this arm and the body of the control device is interposed a spring: 210 under pressure. This arm 259 is so arranged that spring 219 will urge the bell crank 265 in a direction to rock member 292 in a counter-clockwise direction, as viewed in Fig. 8, for moving the finger 264 into the path of movement of the operators control lever I31. The bell crank 265 has a third arm 21I the end of which engages a plunger 212. The opposite end of plunger 212 terminates in a follower 213 engaging one side of a flexible diaphram 21s. The follower 213 is contained in a chamber 215 which is open to atmosphere through a vent 213. At the opposite side of diaphragm 21 i is a pressure chamber 211 which is connected by a passage 218 (Figs. 1 and 7) to a pipe 219 leading to a timing reservoir 280 and to a zero speed or full stop detecting device 28I. When fluid i provided through pipe 219 to chamber 211 below diaphragm 214 in a manner which will be later described, at a suflicient pressure to rock the bell crank 265 against the opposing pressure of spring 210, the interlock member 262 will move finger 264 out of the path of movement of the operators control lever I31 while, when the pressure of fluid in said chamber is of a lower degree, spring 210 will act to operate said member to move finger 264 into the path of movement of the operators control lever as before mentioned.

The zero speed detecting device 28I is adapted to be associated with any rotatable part of the locomotive which turns upon movement of the locomotive along its rails. In Fig. 2 the device is shown, for illustration only, associated with the locomotive drive axle I.

The zero speed detecting device 28I comprises upper and lower casing sections 282 and 283 and a flexible diaphragm 284 which is clamped around its marginal edge between the adjacent ends of said casing sections. The opposite end of the easing section 283 has a bore lined with a bushing 285, the axis of said bushing being arranged in coaxial relation with said diaphragm and at right angles to the axis of the axle I. Below the diaphragm 284 is a non-pressure chamber 286 containing a diaphragm follower 281 engaging the adjacent face of the diaphragm.- At the opposite face of the diaphragm is a pressure chamber 288 containing a follower ring 299 engaging said opposite face. A plunger 29D slidably mounted in bushing 285 and extending into the non-pressure chamber 286 has a reduced portion 29I extending through the follower 281, the diaphragm 284 and follower ring 289 to a point beyond said ring, and mounted on this extended part is a nut 292 which contacts the ring 289'for clamping the diaphragm between said ring and follower 281.

The casing is provided with a stop shoulder 293 which is arranged to be engaged by follower 281 for limiting deflection of the diaphragm 284 in the direction of the locomotive axle I. At the opposite side of the diaphragm is a stop shoulder 294 which is provided for contact with ring 289 to limit deflection of the diaphragm in the opposite direction to a normal position in which it is shown in the drawing. The contact between ring 289 and shoulder 294 is merely for stopping purposes and when such contact is efiected, fluid under pressure may flow from one side of the shoulder 294 to the other so that chamber 288 constitutes space at both sides of said shoulder as indicated by the two lead lines from numeral 288.

A spring 295 encircling plunger 299 within the nonpressure chamber 286 bears at one end on the inner end of bushing 285, while the opposite end of said spring bears against the diaphragm follower 281. This spring is under pressure so as to urge the parts of the device to the position in which they are shown in the drawings and for opposing movement of said parts out of this position by pressure of fluid in chamber 288. It will he noted that chamber 288 is open through pipe 219 to chamber 211 below diaphragm 214 in the operators control device, and it is desired to here point out that the pressure of spring 295 on diaphragm 294 will allow movement of said diaphragm by fluid in chamber 288 at a lower pressure than required to move diaphragm 214 against its opposing spring 2111.

Below the lower casing section 283 the plunger 23%? is cut away for about two-thirds of its diameter to provide at one side an arm 296 which terminates a certain distance above the locomotive axle I. In the end of this arm is secured a fulcrum screw 291 arranged with its axle parallel to that of the loco-motive axle I, and pivotally mounted on this screw and thus carried by and movable with the arm 296 is a collapsible strut Above the fulcrum screw 291 the strut 298 has an ear 299 to which is hooked one end of a tension spring 309, the opposite end of which spring is connected to a pin 39I secured in the plunger 299. The spring 399 is under tension so as to constantly bias the strut 298 in the direction toward the position in which it is shown in Figs. 12 and 13 and to oppose rocking movement of said strut on fulcrum pin 291 in either direction out Of this position. The opposite end of the strut 298 is arcuate in form and secured thereto is a friction shoe 302 made of any suitable friction material, such as a brake lining, for contacting the locomotive axle I. A guide pin 303 carried by plunger 299 extends into a slot 394 provided longitudinally of bushing 285, the pin cooperating with the bushing for maintaining the fulcrum pin 291 parallel to the locomotive axle I.

The reduced portion 29I ofplunger299is provided with a counterbore 395 open to the end disposed in chamber 289, and the nut 292 is provided with a bore through its end, which latter bore is of smaller diameter than bore 395 so as to provide a stop shoulder 396 overlying the open end of bore 385. A plunger 391 is mounted to slide through the opening in the end of nut 292 and is provided within bore 395 with an enlarged head 3% which is adapted to engage shoulder 308 for limiting movement of said plunger outwardly of bore 395. A coil spring 399 disposed in bore 305 bears at one end on the closed end wall of said bore, while its opposite end bears against the plunger head 308, the spring being provided for the purpose of urging the plunger outwardly through the nut 292, such outward movement being limited by contact between the head 308 and the shoulder 396 on said nut. On the opposite end of plunger 391 is a valve 3H3 which is arranged to cooperate with a seat provided on one end of a bushing 3| I. This bushing is secured in a bore in a wall 3I2 separating chamber 239 from a chamber 3I3 which is in constant communication with the atmosphere through an insect excluding device 3M.

With the parts of the zero speed detecting device in the position as shown in Fig. 12, as defined by the contact between the follower ring 289 and stop shoulder 294, the valve 3I0 will be fluid in chamber 3!'!.

posed in an annular recess encircling theplunger.

to atmosphere through a passage 324.

eeatedbyspring 309, andthe plunger head 308 will be spaced from stop shoulder 306 a distance greater than the distance between the locomotive axle and friction shoe 302, so that, withthe .diaphragm 284 deflected in a directionaway from i stop shoulder 294 to a position in which the shoe 332 will just contact said axle, the valve 3!!! will be allowed to remain in contact with its seat under action of spring 309. If the axle is rotating in either direction when the shoe 302 is moved into contact therewith, the friction between said "axle and to the position defined by contact be tween follower 28'! and stop shoulder 293.

Upon this movement, the shoulder 306 on the nut 29?: will engage the plunger head 3% and pull the valve 3!!! out of contact with its seat.

A control valve device 3!5 is provided for supplying fluid under pressure to and releasing fluid under pressure from pipe 279 and thus to and from the timing reservoir 28D; diaphragm chamber 21'! in the operators control valve device, and chamber 288 in the zero speed detect-' in'g device 28!.

The control valve device 3I5 comprises a casing having a chamber 3l6 constantly supplied with ffiuid under pressurefrorn the fluid pressure supply pipe I80. containing a fluid pressure supply valve 3-!8 arranged to control the supply of fluid under pressure from chamber 3H5 .to chamber 3H and thence through a choke 3l9 to pipe 213 above mentioned. A communication including a check" valve 323 by-passes the choke 3H said check valve being so arranged as to render said choke efiective to restrict the rate of flow of fluid under pressure to pipe 219 but ineffective to limit outflow of fluid pressure from said pipe, the communication controlled by said check valve providing for a relatively greater rate of such outflow. v A plunger 32! is slidably mounted in a her 7 in the casing of the control valve device 3l5 in coaxial relation to the supply valve 318; said plunger being subject on one end to pressure of A sealing ring 322 dis- 32! has sealing and sliding contact with the peripheral surface of said plunger to prevent leakage of fluid under pressure from chamber 3!! past the plunger to a chamber 323 which is open The plunger 32! is operatively connected to one end of a diaphragm follower 325, the opposite end of 'which contacts the adjacent face of, 'a flexible diaphragm 326 which is clamped around its marnected through a pipe 328 to the side outlet of The opposite.

a double check valve device 323. ends of the double check valve device are respectively connected to passages 2l5 and 2H5 in the operators control valve device. This double $.check valve device may be of any suitablestruc- 1 ture adapted to operate upon the supply of fluid The casing also has a chamber 3!! 26 under pressure to passage 2!5, with passage 2H3 ventedin the manner before described, to open communication between passage 2l5 and pipe 328 and to close'communication between said pipe I and passage 2.!6, while upon the supply of fluid to passage 2l3, with passage 2i5 vented, the duble checkvalve will connect pipe 328 to passage: 2 !6 and disconnect said pipe from passage 2!5. a l The plunger 32! is provided with an axial bore open through its. lower end to chamber 3!! and within this bore there is a valve seat and a release valve .330. arranged to cooperate with said seat for controlling communication between chamber 3!! and the atmospheric chamber 323. This bore also contains a coil spring 33! which is under pressure and which acts on the release valve 330 for urging the valve to its seated or closed position as .shown in the drawings. The release valve 333 has a fluted stem 332 which extends through the bore in the plunger in the direction of chamber 3!! for contact with a stem 333 extending from the supply valve 3!8. A precompressed spring 334 is disposed in chamber 323. This spring encircles plunger 32! and two oppositely arranged spring seats 335 and 336 which are respectively engaged by the opposite endsof said spring. The sprin seat 335 is connected to the plunger 32! by means of a suitable connecting member 337, while the spring seat 333 is provided at the end adjacent spring seat 335 with an inwardly extending collar 338 overlying a collar 339 on the plunger, but normally supported by the casing out of contact with said collar.

With chamber 32'! open to atmosphere by way of either passage'2 !5 or 2 l 3, the pressure of spring 33 i'will' act to move the plunger 32! to the position in which it is shown in the drawing, which posi'tion i's' defined by contact between the dia- V phragm 32!; and the casing. In this position the spring 33! is adapted to hold the release valve 33!] seated and to position the stem 332 of said "release valve so as to allow pressure of fluid effective in chamber 3H5 to open the supply valve '3!8 for permitting flow of fluid under pressure 1m said chamber to chamber 31 Upon supply orgasm to chamber'32'! at a pressure suflicient 'to deflect the diaphragm 326 against the opposingfpressure of spring 333 said diaphragm will act to move the plunger 32! in the direction of the supply valve3l3 and such movement will be limited by contact between the spring seat 335 and a stop shoulder34t provided in the casing. Upon such movement of plunger 32!, the spring 33! will hold the release valve 333 seated until v the supply valve 3l8 is closed and further move- .ment of said plunger will then be relative to the release valve 333 which will be held against movement due to contact between stem 332 and ,stem 333 projecting from the supply valve 3l8. Thus this further movement will open the release valve33il so as to release fluid under pres- :sure from chamber 3!? to atmosphere by way of passage 324. a In operation, let it be assumed that the op- ;eratorfs control lever I3! is in the portion I42 of. the guide. slot causing movement of the locomotive in a forward direction. The forward directional control valve device 2!! willbe conditioned to supply fluid under pressure to passage 2 !5, while passage 2% will be open to the atmosphere through the reverse directional control valve device 3H8. The fluid pressure thus effective in passage 2I5 will also be effective through the double check valve device 329 in diaphragm chamber 321 of the control valve device 3I5, so that the diaphragm 326 will be deflected to the position for closing the supply valve 3I8 and opening the release valve 339. With the release valve 338 thus open pipe Y219 and chamber 211 below the diaphragm 214 in the operators control valve device will be open to atmosphere, as a result of which spring 210 will be efiective to hold the bell crank 285 in the position in which it is shown in Fig. '1 and the interlock member 282 will be positioned as shown in Fig. 8 with the finger 2B4 disposed in the path of movement of the operators control lever I31. With pipe 219 open to atmosphere as just mentioned, diaphragm chamber 288 in the zero speed detecting device 28I will also be open to atmosphere rendering spring 295 effective to hold the parts of said device in the position as shown in Fig. 12 with the strut 298 out of contact with the axle I. Now let it be assumed that, with the locomotive running in a forward direction as just mentioned, the operator desires to reverse the direction of movement of the locomotive. To accomplish this he will move the control lever I31 out of the portion I 42 of the slot to the adjacent stop position in order to out off the supply of steam to the forward turbine 9 so that the locomotive may be brought to a stop. He will then continue movement of the lever I31 through the forward selection position to neutral wherein it will contact finger 264 of the interlock member 262 which will then prevent further movement ofthe lever to the opposite side of neutral position. With the operators control lever thus moved to neutral position, the forward directional control valve device 2 I1 will operate to release fluid under pressure from passage 2I5 and thereby from diaphragm chamber 321 in the control valve device 3I5. Spring 334 in the control valve device 3 i 5 will then move the diaphragm 32-8 to the position in which it is shown in Fig. l, and as a result, the release valve 338 will be closed and the suppl valve 3I8 will be permitted to open under the pressure of fluid efiective in chamber 3I6. Fluid under pressure will now flow from chamber 3 I 8 to chamber 3 I 1 and thence through choke 3| 9 to pipe 219 and through said pipe to diaphragm chamber 211 in the operators control valve device and also to the timing reservoir 280 and to chamber 288 in the zero speed detecting device 28 I.

The pressure of fluid thus provided in chamber 288 on diaphragm 284 in the zero speed detecting device will then gradually increase at a rate determined by the flow capacity of choke 3I9 until it becomes suificient to overcome the opposing force of spring 295 whereupon the diaphragm 284 will deflect downwardly Or in th direction of the locomotive axle I out of the position in which it is shown in Fig. 12. After a slight degree of movement of the diaphragm 2'84 away from stop shoulder 294, the shoe 392 in the end of strut 298 will contact the locomotive axle I. With the 10- comotive still moving in the forward direction, the rotation of axle -I will then rock the strut 298 on its fulcrum pin 291 to a point where one end of the shoe 302 will move past the axis of plunger 298, whereupon the pressure of fluid effective in chamber 288 on the diaphragm 284 will promptly cause further movement of the diaphragm to the position defined by contact between the follower 2-81 and shoulder 293. The diaphragm 284 as it is thus further deflected will act, through the medium of the plunger 381 and plunger head 388, to

unseat the valve 3 I I], whereupon fluidunderpressure will be released from chamber 288. The release capacity of the valve 3 I 8 'so exceeds the supply capacity of choke 3I9 that when said valve is opened the pressure of fluid in chamber 288 will be suddenly reduced to a sufficientl low degree to permit spring 295 to promptly return the parts of the zero speed detecting device to the position as shown in Fig. 12, for closing valve 3I8, whereupon the strut 298 will be returned to the position in which it is shown in Figs. 12 and 13 by the spring 390.

When the valve 3m in the zero speed detecting device is closed as just described, the pressure of fluid in chamber 288 will again increase by the continued supply through choke 3 I 9 to a sufiicient degree to again operate diaphragm 284 to move shoe 302 into contact with the axle I. If the axle is still rotating the strut 298 will again collapse to permit the pressure of fluid in chamber 288 to operate the diaphragm 284 for again opening the valve 3H] for releasing fluid under pressure from chamber 288.

The zero speed detecting, device will continue to operate as just described as long as the axle I is turning in order to prevent the pressure of fluid increasing in diaphragm chamber 211 of the operators control device sufiiciently to overcome the opposing force of spring 218 on the bell crank 285. However, as soon as the locomotive comes to rest, at which time the axle I will cease rotating, the strut 298, when the diaphragm 284 is moved downwardly from the position in which it is shown in Figs. 12 and 13 by pressure of fluid in chamber .288, will merely move into contact with the axle and then support the diaphragm 284 against further movement so that the valve 3I9 will remain seated. When the valve 3|!) is thus held against opening, the pressure of fluid in chamber 288 and in chamber 211 in the operators control valve device, will then increase to the higher or greater degree required to deflect diaphragm 214, against the opposing force of spring 210. This deflection of diaphragm 214 will rock the bell crank 265 and in turn the interlock member 282 in the direction for moving the finger 2 54 out of the path of movement of the operators control lever I31. The lever I31 may then be moved from neutral to its reverse selection position and then into-the portion I43 of its guide slot to cause operation of the reverse turbine 9 to move the locomotive in the reverse direction.

It will now be seen that the zero speed detecting device 28! and the interlock member 262 will prevent the operator from operating his control device to cause steam to be supplied to the reverse turbine I2 with the locomotive moving in a forward direction, so that said turbine cannot act in the capacity of a brake.

In case the engine is moving rearwardly and the operator desires that it move forwardly he will move the lever I31 from whatever position it may occupy at the left-hand side of neutral" position, as viewed in Fig. 3, back to neutral" position where it will be stopped by finger 284 of the lock member 262 for reasons which will be apparent from the above description. However, after the locomotive is brought to a complete stop from movement rearwardly, as detected by the zero speed detecting device 28 I, the finger 264 will be drawn out of the path of movement of lever 'I31 so that said lever may then be operated to cause steam to be supplied to the forward turbine 9 for moving the locomotive in a forward direction. Thus with the locomotive operating .29 in a rearward direction, steam cannot be supplied to. the forward turbine 39 until after the locomotive is brought to a complete stop, so that said turbine cannot act in the capacity of a brake.

It will be noted that the slots 253 and 253 in the interlock member 232 permit shifting of said member longitudinally in order to permit movement of the operators. control lever I31 to neutral position from either side of neutral position in order that the zero speed detecting device will be rendered operative for either direction of movement of the locomotive.

It will also be noted that if the locomotive is running either in the forward or in the reverse direction and the operator moves the control lever 131 to neutra position, at which time the interlock finger 284 will act to prevent further movement of said lever, and the operator then desires to continue movement of the locomotive in the last direction of operation he may move the lever I31, without hesitation, back into the portion M2 or I43 of the slot last employed, since the interlock finger 234 has no control over such movement to continue running of the engine in the same direction.

In case the locomotive is stopped, and the operators. control lever is in neutral position, the

zero speed interlock device will be conditioned by contact of strut 298 with the locomotive axle l to permit such pressure increase in chamber 313 on diaphragm 214 of the operators control valve device to move the interlock finger 255 out of the path of movement of the lever I37, so that without any delay the operator may move said lever in either direction from neutral position to attain the desired direction of movement of the locomotive.

' After the finger 264 is withdrawn from the path of movement of. the. operators control lever I31 and said lever ismoved out of neutral position to cause reverse movement of the locomotive as above described, it should be noted that fluid under pressure is supplied to diaphragm chamber 32! in the control valve device 315 which will effect operation of said device to open the release valve 330 for venting fluid under pressure from the timing reservoir 28B, chamber 288 in :thezero speed detecting device and diaphragm chamber Tllthe operators control valve device, this venting occurring rapidly past the check valve 320. The parts of the zero speed detectingdevice will therefore return to the position in which they are shown in Fig. 12 and finger 233 will promptly move into the path of movement .of lever I31 and then remain in this position as long as the locomotive is being propelled in the selected direction.

It will therefore be apparent that if the locomo side of neutral position to obtain movement in ,the said opposite direction until after the locomotive is again brought to a stop.

When the locomotive is moving in the forward direction with the operators control lever 13'! out of neutral position, the forward directional control valve device ill will open communication between the fluid pressure supply pipe [83 and plunger chamber 206 in the forward selector valve device I81 so as to actuate said device for opening communication between the self-lapping Speedvcontrol valve device 190 and diaphragm chamber .62 in the forward throttleadjusting motor 43, as previously described. It will thus be seen that in case of loss of fluid under pressure from pipe I80, the forward selector valve device I81 will automatically operate to close communication between the speed control valve device I90 and the forward throttle adjusting motor 40 and to release fluid under pressure from chamber 62 in said motor for causing operation of said motor to cut off the supply of steam to the forward turbine. The same is true in case the operators control lever I3! is out of neutral position in the direction for supplying fluid under pressure to the reverse throttle adjusting motor ll for causing movement of the locomotive in the reverse direction. Thus, regardless of the direction of movement of the locomotive, failure of the supply of fluid under pressure to the fluid pressure supply pipe I83 will automatically effect the cutting off of the supply of steam to the respective turbine 9 or l2.

The supply of fluid pressure to pipe Hill is obtained from the main reservoir 88 through pipe 8?, a suitable reducing valve device 34!, pipe 342, a lubricant pressure interlock valve device 343 and speed limiting means comprising a cutoff valve device 334 and forward and reverse speed limiting valve devices 355 and 346, respectively, which are provided for controlling operation of said cut-off valve device.

The interlock valve device 343 comprises a plunger 33'! which is slidably mounted in a suitable casing and also comprises a. ring seal 348 which is disposed in a recess encircling said plunger and having sealing and sliding contact therewith for preventing leakage of fluid under pressure from a chamber 349 at one end of said plunger to a chamber 350 at the opposite end, the chamber 353 being open to atmosphere through a port 35 I. The plunger 34'! is connected by a stem 352 to a fluid pressure supply valve 353 contained in a chamber 354 to which the mild pressure supply pipe I is connected. The stem 352 extends through an opening in a wall 355 which is provided with a seat for engagement by the supply valve 353 to close communication through said opening between chamber 354 and chamber 343. A spring 356 in chamber 354 acts on the supply valve 353 for urging it into contact with its seat. The supply valve 353, stem 352 and plunger 33? are provided with a bore open at one end to chamber 354 and open at the opposite end through a seat to chamber 350 which contains a release valve 35'! arranged to cooperate with said seat for closing communication between chambers 354 and 350.

The interlock valve device 343 further comprises a flexible diaphragm 358 clamped around its margina1 edge in the casing in coaxial relation with the release valve 351 and supply valve 353. At the side of diaphragm 358 adjacent the release valve 35? is a non-pressure chamber 359 containing a follower 363 having one side engaging the diaphragm. At the opposite side of fol.- lower 333 is an annular stop 36! arranged to be engaged by said follower for limiting movement thereof and deflection of the diaphragm 358 in one direction. At the opposite side of diaphragm 353 is a pressure chamber 352 into which extends a stop 353 arranged to be engaged by said diaphragm for limiting movement thereof in the opposite direction.

The follower 333 has a stem 3E4 slidably mounted in a bore provided through an adjusting .nut 355, and the, end of this stem is connected to the end of a'stem 3'66 projecting from the release valve 351. A precompressed spring 361 encircling follower stem 364 bears at one end on the nut 365 while the opposite end bears against the follower 380 for urging said follower and the diaphragm 358 in the direction of stop 363. The pressure of this spring on the follower and on the diaphragm is adjusted by the regulating nut 365.

The pressure chamber 362 is connected to th discharge pipe 45 of the constant speed lubricant pump 43 driven by turbine 42 so that the diaphragm 358 will beconstantly subject in chamber 332 to the pressure of lubricant delivered by said pump. Assuming that the pump 43 operates to maintain the intended substantially constant pressure of lubricant in pipe of for instance 35 .lbs., this pressure, effective in chamber 362 on diaphragm 358 will overcome the opposing force of spring 361, and hold said diaphragm in the position in which it is shown in the drawings for seating the release valve 351 on plunger 34'! and for shifting said plunger to open the supply valve 353 for thereby opening communication between the fluid pressure supply pipe I80 and a passage 388 leading to the cut-off valve device The spring 361 may be adjusted to move the diaphragm 358 against the opposing pressure of lubricant in chamber 382 if the pressure of such lubricant becomes reduced to a chosen low degree such as 10 lbs, under which condition the dia-- phragm .353 will be moved by spring 331 into contact with stop 383 to permit closing of valve 353 by spring 356 and opening of the release valve 361 by pressure of fluid from pipe I80. With the release valve 351 open, fluid under pressure will be released from the fluid pressure suppl pipe I80. Thus, if, while the locomotive is in motion, the pressure of lubricant delivered by the pump 43 for lubricating diflerent parts of the locomotive and turbines should become reduced to the undesirably low degree above mentioned, the interlock valve device 343 will automatically operate to release fluid under pressure from pipe I80 and thereby cause release of fluid under pressure from diaphragm chamber 82 in the forward or reverse throttle adjusting motor or 4|, whichever is effective, so as to cut off the supply of steam to the effective turbine 8 or 12 of the locomotive to provide for stopping of the locomotive.

Moreover it will be noted that in case the pump 43 fails to provide suflicient pressure in pipe '45 for actuating the interlock valve device 343 to open the supply valve "353 therein, with the locomotive at a standstill, the fluid pressure supply pipe I80 will be maintained open to atmosphere so that theoperator will be unable to supply steam to either turbine to cause movement of the locomotive.

The cut-off valve device 344 comprises .a casing having a chamber 360 which is arranged to be supplied with fluid under pressure from the reducing valve device 341 through pipe 342. The casing also has a chamber 3'10 containing a fluid pressure supply valve 31I for controlling communication between chamber 309 and chamber 310 and thus between the fluid pressure supply pipe 342 from the reducing valve device 34I and passage 368 which opens to chamber 310. The casing further comprises a plunger 312 slidably mounted in the casing and subject on one side to pressure of fluid-in chamber 310 and on the opposite side to pressure of fluid in a chamber 313 which is open to atmosphere through a passage 314. A sealing ring 315 disposed in a groove in the casing provided around plunger 312 has sealing and sliding-contact with said plungerto prevent leakage of fluid under pressure from chamber 3.10 to chamber 313. In chamber 313 one end of plunger 312 is connected to a follower 316 which contacts one face of a flexible diaphragm 31.1 which is clamped around its marginal edge in the casing. One side of this diaphragm issubject to atmospheric pressure in chamber 313 while at the opposite side is a pressure chamber 318 which is open to a control passage 319.

The plunger 312 is provided with a bore open at one end to chamber 310 and has an internal valve seat for engagement by a release valve 380 contained in said bore for controlling communication between chamber 310 and chamber 313. This bore also contains a coil spring 38I acting on the release valve 3.80 for urging it to its seated positionas shown. The release valve 380 has a fluted stem 382 extending through the bore in the plunger in the direction of chamber 310 and arranged for contact by a stem 383 projecting from the supply valve 3'. In chamber 313 a coil spring 3184 encircles the plunger 31.2, One end ofspring 384 bears against a seat.385 which is secured for movement with the stem by a member 386. The opposite end of .the spring is supported on a seat 381 normally supported on the casing and having a flange 388 arranged to interlock with a collar 380 on the plunger.

Due to the connections between spring 5384 and plunger .312 through the seat 385 and due .also to the fact that said spring is precompressed between the two seats, said springexerts a certain pressure against the diaphragm 311 .for urging same to the position in'which it is shown in the drawings. with the diaphragm .311 in this position, the release valve 380 will be. closed by spring 31H while the :supply valve 31] may be opened by pressure .of fluid from pipe 342 sothat fluid from said pipe will .flow tochamber 310 and thence through passage 368 to chamber 349 in thelubricant interlockva'lve device 343.

With the parts of the interlock valve device .343 positioned as shown in the drawing, when the pressure of lubricant delivered by pump43 exceeds the chosen low degree, fluid supplied to passage 368 will besupplied to the fluid pressure supply pipe I80. However, when fluid. is supplied to diaphragm chamber 318, as will be later described, at a pressureexceeding the opposing force of sprin 384, diaphragm 311 will deflect downwardly to a position defined bycontact between spring seat 385 and a stop shoulder 38.9 in the casing. This movement of diaphragm 3.11 and thereby of follower "31 6 will act through spring 38I and release valve 300 to move the supply valve 31I into contact withits seat for cutting off the supply of fluid under pressure from the supply pipe 342 to passage 368 and thence to the fluid pressure supply pipe I80. After the supply valve 511i is closed, continued movement of diaphragm 311 will move plunger 312 relative to'the release valve 380 which at this time will be held against movement by the seated supply valve 31I, thereby opening said release valve. When the release valve is thus opened,

passage 368 will be connected to atmosphere so as to release fluid under pressure from the fluid pressure supply pipe I80.

The passage 310 leads to the .side .outlet of a double check valve 1390 the opposite ends of Which are open to passages Bill and 392 leading to the forward and reverse speed limiting valve devices 345 and 3&6, respectively.

The .forward speed limiting va1ve-device .345 

